Navkarsi time is not a fixed clock time for all days – it depends on that day’s sunrise in Bangalore.

Basic rule (both Śvetāmbara and Digambara): Navkarsi = 48 minutes after local sunrise.

• If sunrise in Bangalore is 6:30 am ⇒ Navkarsi ≈ 7:18 am
• If sunrise is 6:45 am ⇒ Navkarsi ≈ 7:33 am

So for any date in Bangalore:

1. Find that day’s sunrise time for Bengaluru.
2. Add 48 minutes → that is your Navkarsi start time.
3. First intake of water or food should be only after this time, and ideally after doing morning kriyā (Samayik/Pratikraman, etc.).

For a proper Navkarsi:

• Previous evening: best is to do Chovihār (no food, no water after sunset).
• Next morning: wait 48 minutes after sunrise, then start.

You can read a simple explanation of Navkarsi calculation and pachkhan here